Antifiltering closure for paper bags



Oct. 8, 1940. J. s. SIEMPSQN 2,215,857

ANTIFILTERING CLOSURE FOR PAPER BAGS Filed Aug. 16, 1957 Macs \ST .50 71/,

Patented Oct. 8, 1940 UNITED STATES PATENT OFFICE ANTIFILTERING CLOSURE FOR PAPER; BAGS James S. Simpson, Auburn, N. Y., assignor to Columbian Rope Company, Auburn, N.- Y., a

corporation of New York Application August 16, 1937, Serial No. 159,393 4 Claims. (Cl. 229-62) This invention relates to improvements in closures for bags formed of paper or similar material and, particularly, for bags of that construction used as containers for granulated or pulverulent materials.

In the use of paper bags for materials such as piercing the same in stitchi'ngthe seam are not fully closed by the stitches and, as a result, the

contents of the bag may sift or filter through these rather minute openings. For this reason, it has generally been the practice to provide auxiliary means for closing these perforations or openings, such means also, in some instances, serving to reinforce the seam. In each such prior instance, however, one or more difliculties or disadvantages have been encountered. For instance, where a member or cord made of cotton is used on bags containing sugar particles of cotton often detach as themselves, particularly while the bag is being emptied and fall into the mixture in which the sugar is being used, thus necessitating additional straining operations to remove such particles. 0n the other hand, if thebags are used for eement, capillary action often causes the contents of the bag to be damaged by moisture gaining access thereto. Paper members have been used in lieu of cotton but in every known instance of this nature, the construction or formation of said member has been such as to rather seriously interfere with the bag closing operation, as by the paper deflecting the sewing needle or causing the needle to heat up and break or otherwise lowering the efficiency in sewing.

The primary object of the present invention,

therefore, is to provide a bag closure and an antifiltering member for the closure which will prevent loss of the bag contents by filtering through the openings made by the needle and which will eliminate the difficulties previously set forth.

More specifically, the invention contemplates an anti-filtering member preferably in the form of a cord made of paper, the paper being crushed to form the cord with the creases extending parallel to the longitudinal axis of the cord. In

other words, the paper is substantially free of twist in the finished cord.

With these and other objects in view, the invention consists'in certain details of construction and combinations and arrangements of parts, all

avoiding heating of the needle.

as will hereinafter be more fully described, and the novel features thereof. particularly pointed out in the appended claims.

In the accompanying drawing- 1 Figure 1 is a face view of one end of a bag em- 5 bodying the preferred form of the invention;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1; and

Fig. 3 is a detail view of a short length of the present anti-filter cord, one end thereof being 10 shown as having been opened out to more clearly illustrate the parallel disposition of the creasesformed by crushing the paper in producing the cord.

A s illustrated in Fig. 1, the end of the bag 13-15 closed by securing the walls of the bag together by stitching a seam across the same, the individual stitches of this seam being indicated at H). The thread constituting the stitches does not completely fill the openings made by the needle pierc- 2o.

ing the bag wall, as previously mentioned and, hence, the use of the antifllter cord strip- II. The cord is shown in Fig. 3 and for reasons set forthabove, it is made of paper crushed along lines parallel to each other and to the longitudi- '26 nal axis of the cord. It 'will be noted that the stitches extend through the cord, but the cord being free of twist,- there are no curving folds and, consequently, no tendency to deflect the needle during the sewing operation. Also, the crushed 30 paper cord is easily penetrated by the needle, thus Likelihood of damaging or breaking the needle, or reducing the efficiency of the sewing operation is, therefore, eliminated or reduced to a minimum. 35

Compared with the cotton filter cord, the present cord possesses greater strength. It is less 'expensive (foot for foot) than any of the previously. used filter cords and, having no twist, it has an inherent tendency to lie flat on the surface of the 40 bag and also tends to flow into or enter, and thus more efficiently close, the needle holes- It will be understood that either or both ends of the bag may be closed by sewing and, if desired, a small sheet of paper l2 can be folded over the 45 bag end, although this is not at all necessary. It has just been pointed out that the present cord possesses considerable strength so that it effectively reinforces the bag at the seam.

What I claim is: r a

1. A closure for paper bags which comprises a stitched seam for securing together the walls of the bag adjacent their ends, and a reinforcing antifiltering cord formed of crushed paper extending longitudinally of the seam with the stitches passing through said cord, the creases in the paper formed by the crushing thereof extending substantially longitudinally of the cord and seam.

2. A closure for paper bags which comprises a stitched seam for securing together the walls of thebag adjacent their ends, and an antifiltering element formed of a crushed paper overlying the apertures in the .bag walls formed by the stitches passing therethrough, the stitches oi the seam also extending through said element.

3. A closure for paper bags which comprises a stitched seam for securing together the walls of the bag adjacent their ends, and an antifiltering means at each side of the bag overlying the apertures formed by the stitches extending through the bag walls, said means being formed of untwisted, crushed paper cord with the stitches extending therethrough, the creases in the crushed paper extending longitudinally of the seam.

4. An antiflltering element for preventing flltering of the contents of a paper bagthrough openings formed in the bag walls by the stitches forming the seam by which the walls are secured together for closing the bag, said element being formed of a crushed paper cord having creases mized.

JAMES S. SIMPSON. 

